Bending machine



A. CHAUSSON BENDING MACHINE Dec. 4, 1962 M. 1 N M m w a M AL m L 7 .M W 1 u 1 1 1 V |1|| r1 111111 "H11 N R E. lm nrrllllmlnbl; H MP |1|,|1 1|11| m :E WL M 1: 3. I -.1 m.n. ,l..f..... l 1 1 1 11H1 f. ....m,.|..,u.ww f f 1 n TmwmhmwmwtLen-- 1.111.111 s. 1 PNV WN. R MQW MIJN nw .Q w M .3v u ...ha m l n A. CHAUSSON BENDING MACHINE Dec. 4, 1962 '7 Sheets-Sheet 2 Filed July 28, 1960 A. CHAUSSON BENDING MACHINE Dec. 4, 1962 7 Sheets-Sheet 3 Filed July 28, 1960 DeC- 4, 1962 A. cHAussoN 3,066,718

BENDING MACHINE Filed July 28, 1960 7 Sheets-Sheet 4 A. CHAUSSON Dec. 4, 1962 BENDING MACHINE Y 7 Sheets-Sheet 5? Filed July 28, 1960 mf'MuJsoA/ Dec. 4, 1962 A. CHAUSSON 3,066,718

BENDING MACHINE Filed July 28, 1960 7 Sheets-Sheet 6 Dec. 4, 1962 A. cHAUssoN 3,066,718

BENDING MACHINE Filed July 28, 1960 Fic-m15.

7 Sheets-Sheet '7 Fri @1.14.

,4A/mf O/Ausso A/ r j 'i cares Faint die 3,066,713 EENING MACHHNE Andr Chausson, Asnieres, France, assigner to Societe Anonyme des Usines Chausson, Asnieres, France, .a company of France Filed lluiy 28, 19619, Ser. No. 45,873 Staines. (Cl. 153-2) The invention relates to a bending machine which enables, owing to adjustments that can be quickly made without special skill, to manufacture a large dimensional variety of work parts. This machine operates at a high rate and does not require permanent supervision, because any anomaly involves the immediate stoppage of this machine, manual operations consisting exclusively in positioning the original tubes.

According `to the invention, the bending machine is characterised in that it comprises a device for arranging a predetermined length of tube in a holder associated with a milled-wheel whose rotation is controlled ,by a driving member in time relation with the actuating of the device for arranging and starting up a saw, these various elements being controlled by a controlling device of angular bending amplitude, of the stroke for bringing along the tube and the position of the saw to the selected values of the various parameters corresponding to the part to be obtained.

Various other characteristics of the invention will moreover be revealed by the detailed description which follows.

One form of embodiment of the invention is shown, by way of example, in the accompanying drawings.

FIGURE 1 is a side elevation of the bending machine according to the invention.

FIGURE 2 is a plane view of this machine.

FIGURES 3 and 4 are partial plane views, similar to FIGURE 2 and limited at the brackets III and IV of that ligure, showing on a larger scale, an element forming part of the machine.

FIGURE 5 is a section taken along the line V-V of FIGURE 3.

FIGURE 6 is a section taken along the line VI-VI of FiGURE 4.

FIGURES 7 and 8 are partial sections taken along the lines VII- VII and VHF-VIII respectively of FIG- URE 6.

FIGURE 9 is a plane view taken along the line IX-IX of FIGURE 1.

FIGURE 10 is a section taken along the line X-X of FIGURE 9.

FIGURE l1 is a section taken along the line XI-XI of FIGURE 10.

FIGURE 12 is a section taken along the line XII-XII of FIGURE 2.

FIGURE 13 is a plane view taken along the line XIII- XIII of FIGURE l.

FIGURE 14 is a section taken along the line. XIV- XIV of FIGURE 13.

FIGURE 15 is a partial section taken along the line JJV of FIGURE 14.

FIGURE 16 is a side elevation, to FIGURE 13.

FIGURE 17 is a plane View of the product obtained by means of this machine.

The bending machine comprises a hollow frame 1 in which a certain number of the members of the machine are housed, the other members being supported by an upper tray 2 pivotally mounted on the frame 1 (FIG- URES l and 2). The tray 2 is integral, at each of its ends, with plates 3 and d (FIGURES 1 to 8) in which guiding slots 5 and 6 are made, as well as in the tray.

partly cut away, similar Slides 7 and S rest on these plates, provided with shoes 9 and 11) respectively, engaged in the slots 5 and 6. These shoes are prolonged by plates 11 and 12 placed under the tray 2 and overlapping the slots 5 and 6.

The plates 11 and 12 are rigidly connected by a U- shaped section 13 supporting, in the vicinity of the slide 7, a strap 14 which is integral with the piston of a jack 15, pneumatic, for example, fixed under the tray 2. The strap 14 also has a boss 16 projecting, actuating, at the end of the outward stroke (stroke opposite to the direction of the arrow F), of a gate 17 extended under said tray. The section 13 also supports, close to the slide 8, a finger 13 forming an abutment for limiting the stroke. A cylindrical mandrel 19 is mounted overhanging in a support 20, integral with one of the ends of the slide 7, to enable a tube to be bent 19a to be slipped on, the play provided between the mandrel and each tube being exactly necessary for facilitating this operation.

As can be more clearly seen in FIGURES 4, 6` and 8, the slide 8 is provided with an articulation pivot 21 of a pulley 22 in which a peripheric groove 23 is cut that is semi-torio, whose radius corresponds to that of the tube. At an intermediate level between the pulley and the slide 8, a support 25 is pivotally mounted on the latter, around a spindle 24. This support has a projection at its free end in the shape of a plate 26, delimiting a semi-cylindrical groove 27 for guiding the tube, the mandrel 19 penetrating between the pulley 22 and the plate 26 for at least part of its stroke.

Furthermore, the slide 8 is prolonged laterally by a promontory 28 with a projecting rim 29 in which a bead 30 is housed. The rim 29 is provided with a spindle 31 for pivoting a rocker 32, integral with an operating lever 33. A boss 35 of the support 25 is, moreover, traversed by a stop 34, adjustable by menas of an abutted nut 34a, whose projecting end is placed on the passage of the rocker 32.

By pivoting this rocker from the disengaged position 33a to the locked position 33b, the support 25 is made to pivot in the direction of the arrow F1, then said rocker, bearing on the bead 30, tends to thrust the stop 34. In the position 33b of the rocker 32, the tube must be slightly seized between the plate 26 and the pulley 22, so as to allow the tube to be taken along during the advance of the mandrel 19 in the direction opposite to the arrow F,

.but also the sliding of this tube, without deformation or scratches, on the mandrel 19 and in the pulley 22 and the plate 26, during the sliding of the slides 7 and 8 in the direction of the arrow F and when this tube is drawn in the opposite direction.

The machine also comprises a sawing unit shown in FIGURES 9 to l2. This unit comprises a tipping underframe 36, with a U-camber, passing into an aperture 37 made in one of the corresponding longitudinal walls 38 of the frame 1. The underframe is integral with a collar 39 fixing this .underframe on a shaft dll, pivotally mounted and sliding in two pairs `of bearings 41 and 42 attached to the internal face of the wall 33. The tipping underframe 36 is provi-ded with a stop 43, adjustable by means of a screw 44, limiting tipping, in the direction of the `arrow F3, of said underframe by contact with the wall 38 of the frame.

A motor 45 mounted at the end on a plate i6 integral with the underframe 36, is intended to rotatively drive a circular saw 47 covered over nearly all of its circumference by a thick casing 4S for protection. A rider 49 is placed on the shaft dit to enable the attaching of a resilient member 5i) whose free end is fixed on the bearing 41. This resilient member consists, in the example shown, of a helicoidal spring tending to return the underframe 36, in the direction of the arrow F3, from the disengage position shown in FIGURE 12, to the sawing position shown in FIGURE 9. The spindle of the inactive spring is rectilinear whereas the spindle of this spring under tension is spiral.

The free end of the shaft itl is shaped like an articulation cap 51 of the piston 52 of a jack 53. The latter, constantly under pressure when the machine is working, is intended to apply a lug 49a projecting on the rider 49, against a ixed abutment, described hereafter, and this in order to determine in a precise manner, the position of the saw in relation to the tube. When starting up the machine, the general switch for controlling the feed to the jack 53 is closed, which has the effect of causing the shaft 40 to slide in the direction of the arrow F4 until the lug 49a comes into contact with the xed abutment.

Another double-acting jack 54- is supported by the frame of the machine. The piston S of this jack, emerging at both ends of the cylinder, is guided in a fixed journal 56. The latter has a lateral projection with a boss 57 for guiding a push-rod 5S provided with a roller 59 in contact with one of the generatrices of the piston S5 (FIG- URES 9 and ll).

The free end of the push-rod 53 is prolonged by a small boss 66B against which there is pressed, by the resilient member i, the radiating lip 6l of a bushing 62 iixed `on the shaft 40. The lip 6l extends for a length at least equal to the maximum stroke of the shaft 4t), so as to be always in contact with the small boss 60 whatever the position of the saw.

Also, a cavity 63 is hollowed in the piston 55 of the jack to enable the push-rod 58 to slide in the direction of the arrow F5 when the small boss oil of the latter is thrust by the resilient member Si). This sliding is accompanied by the pivoting, in the direction of the arrow F3 and under the `action of the resilient member StB, o the underframe 36 supporting the saw 47 for setting up sawing.

So that sawing can yonly be effected when the piston 55 slides in the direction of the arrow F6, it is necessary to create a locking of the push-rod S8 during the return stroke of said piston, to prevent the roller 59 from penetrating into the cavity 63. To this end, a shouldered spindle 64, transversely guided in the boss 57, traverses la slot 65 made in the push-rod SS. When the smaller diameter end of the spindle 64 is placed in the lengthened part ofthe slot 65 (position shown in FGURES 9 and ll) the push-rod 58 can slide, whereas when the larger diameter and is placed in the flared part of said slot the pushrod 58 is locked in a position corresponding to the disengaging of the saw.

The piston 55 of the jack 54 is moreover provided with two iingers 66 and 67 placed on either side of the spindle 64, their distance apart corresponding to the stroke of the piston in the jack. When the piston slides in the direction of the arrow F6 the roller 59 of the push-rod 58 penetrates into the cavity 63 and comes out to cause sawing, then the linger 66 acts on the larger end of the spindle 64 for locking this push-rod.

During the return stroke of the piston, the push-rod is immobilised by the spindle 64, and in particular, when the roller 59 is facing the cavity 63, then the ringer 67 acts on the smaller end of the spindle 64 for releasing said push-rod.

The other end of the piston 55 is able to actuate, at the end of the outward stroke (arrow F6), a gate 68, and at the end of the return stroke, a gate o9 (FIG. 2).

The tray 2 of the machine also carries a lever 70 pivoting around a spindle 71 (FIGURES 2 and l2). This lever consists of two tubes 76a and 7Gb strutting a bushing 72 surrounding the spindle 71, and a bushing 73, forming a support bearing for a shaft 74, whose lower end is integral with a crank 75. The head of the latter is connected with the rod 76 of the piston of a `double-acting jack 77, by means of a connecting rod 7S pivoted on the d rod 76 and on the crank 75 by means, respectively, of spindles 79 and 3d.

The rod 76 is extended on the other side of the piston, by another rod 8l. emerging from the jack cylinder. This latter has a projecting rim 82 able to actuate a gate 83 at the end of the return stroke of the piston, whose direction is opposite to that of the arrow F7 (FGURE 2).

The upper end of the shaft 74, traversing the tray 2, is integral with a cylinder 34- of a double-acting jack. An extension 85 of the cylinder forms guiding slides for a rod 6 connecting the piston 37 of this jack to a jaw 38 in which a semi-cylindrical groove 39 is cut.

The uid under pressure of each etiect is conveyed to the corresponding chambers, separated by the piston 87 in the cylinder 84, by the channels itl and @l cut in the laer and the shaft 74. The channels emerge respectively in grooves 92 and 93 cut in the bushing 73 and communicating with the xed pressure points of the uid circuit. This system of channels enables the mobile jack 84 to be fed from xed points.

A removable bending milled-wheel 94 is threaded on to the upper end of the shaft 74 and immobilised, in relation to the latter, by means or" a pin 95 connecting this milled-wheel to the extension 85 of the cylinder S4. A partial semi-torio groove 96 is cut on the periphery of the milled-wheel and according to a curvature radius appreciably corresponding to the bending radius of the tube .to be shaped. The rod 5 is also provided with a nipple 97 moving in `a groove 9% of the milled-wheel 94, this nipple limiting the opening stroke of the jaw 88 by abutting against one of the ends of the groove 98.

At the beginning of bending, the milled-wheel 94 and jaw S8 as well as the members associated with them, are placed as shown in FIGURE 2. in particular, the jaw S8 abuts against the plate 26 of the support 25 and the semi-cylindrical grooves 27 and 89 of the latter are aligned. The milled-wheel 9d, tangent to the jaw 88 `from the joint of the latter and the plate 26, is somewhat remote from the pulley 22.

Moreover, the upper tube '70a of the lever 7@ is integral with a perforated small plate 99 intenced by introducing a pin Miti traversing the tray 2, into one of the holes of said plate, :to determine the position of the lever 7d, which position is variable in reiation to the milled-wheel 942- used. Actually, the machine comprises a set of milledwheels, different from each other in relation to the curvature radius R of the tubular part itil (FIGURE i7) -to be made on this machine, and the diameter d of the tube from which lthis part is obtained.

As can be particularly seen in FEGURES l, 2 and 13 to 16, the tray 2 supports a device 162 for controlling the feed of the various jacks of the machine at a predetermined work cycle and for controlling the strokes of these jacks at a certain number of alternatives such as shown in FIGURE 17, i.e., the lengths L and Z of the straight parts ltl and we of the part ll and the angular opening a of the curved part M5 of the same par-t.

The device comprises a sleeve libe fixed on the tray 2 and intended to `guide :a central vertical shaft M37 whose lower part is made integral, by means of a nut MBS and a key itil with a notched disc llt?. The latter has notches lll in its periphery, to the non-restrictive number of sixteen in the example shown, selectively intended for the penetration of a spur H2 integral with the frame l. This spur enables sixteen different posi- Itions of the disc il@ to be chosen, which correspond to sixteen possibilities of varying the group of parameters L, l :and a of parts lul. It is quite obvious that each group of parameters L, l and fr can correspond to an important number of parts, by combining these parameters with the other parameters R and d which can be varied by changing the milled-wheel 91?-, the jaw 87, the plate 26, the pulley 22. and the mandrel i9.

To pass from one position of the disc il@ to another,

`it has been chosen, in the example shown, to lower the shaft 1157 in the direction of the arrow F8 `to disengage the disc 1111 from the spur 112 and revolve this shaft in the sleeve 111:5, then when the notch has been selected corresponding to the new position, to raise the shaft 1117 so that the disc is immobilized by the spur 112.

To this end, a spring 113 is inserted between the sboulder-piece 11d or" the shaft 1117 and a small collar 115 of the sleeve his spring Itends to raise the disc 110 until a central tray 116 supported by this disc, abuts against `the sleeve a position in which the disc is locked, Moreover, the shaft 1'37 is provided with a handle 117 and an operating lever 113, respectively intended for seizing, for thrusting the disc 119 downwards and to turn this disc to a suitable extent.

in order visually to be able to control the posi n of 'this disc 111?, the shart 1137 is surrounded by a ring 119 which is covered by a basin 1211 iixed on the tray 2. The ring 119 is angularly wedged in relation to the shaft 1117 by means of a nipple 121 integral with this shaft and penetrating into a longitudinal groove 122 of the ring. This latter has guiding-marks 123 engraved in its periphery, each iigured mark, for example, being intended to characterise a position of the tray when it comes in Vfront `of a port 1211 rnade in the basin 121i.

The disc 11?` supports an annular tray 125 concentric to the central tray 11o, which is itself concentric to the shaft 1? on to which it is threaded. The trays 11o and 125 rest on small felt tongues 125 which are radially embedded in the notched disc 11i?.

lt will be noticed that the central tray 116, the annular tray 125 and the notched disc 116, delimit three independent zones, 127, 123 and 12@ placed at different levels and supporting series of projections, 13d, 131 and 132 respectively; in order to make the drawing clearer, FIGURE 13 shows only one projection of each of these three series. Each series comprises as many projections as the disc 1113 delimits by notches 111, these projections placed differently in relation to the ,correspondao notches, which enables the parameter to be varied for each series, namely, the parameter a for the projections 13d, the parameter l for :the projections 131 the parameter L for the projections 132.

Actually, the projection 132 selected is placed on the course of the lug 19a of the rider 49, integral with the shaft it? of the sawing unit, so that this projection limits the sliding of the shaft 40 drawn by the jack 53 in the direction of the arrow F4 and hence, determines the position or the saw i7 in relation to the bending shaft '74 (parameter L). When the parameter L is small or even nil, the saw 47 tends, during cutting, to penetrate into the milled-wheel 94. To obviate this disadvantage, appreciably radial slots (not shown) can `be cut in the cuting-wheel for the passage of the saw.

Likewise, the projection 131 selected is placed on the course of the finger 13, integral with the `connecting scction 13 of the slides 7 and supporting the mandrel 19, so that this projection limits, when the annular tray 125 is immobilised in relation to the disc 11i) (as described further on), the `strole of the mandrel 19, pulled in the direction of the arrow F, by the jack (parameter I).

Lastly, the projection 1.3i) selected is placed on the trajectory of a iinger 133, projecting under the rod 76 of the jack 77 so that this projection 130 limits`when the central tray 116 is immobilised in relation to the disc 110 (as described in that which follows-the stroke of this rod moving in the direction of the arrow F7, a stroke which determines the parameter a.

Moreover, the central tray 116 has equidistant nipples 13dprojecting on its periphery, intended selectively to actuate a gate in relation to a notch 11 chosen. Two 136 of these nipples 13d emerge under the central tray 116 in curved grooves 137 made in the disc 111B. These nipples are subjected to the action of resilient members 138 bearing against one of the ends of the grooves 137 While tending to thrust the nipples 136 and hence the AUI central tray `116 in the opposite direction to the arrow F9. The two nipples 139 placed above the grooves 137, are flush with the lower face of the central tray 116 so aS not to hinder the working of the springs 13S. The other nipples 13,4 penetrate into other curved grooves 14d which are very short, intended to limit the pivoting of the central tney 116 in relation to the disc 110.

Thus, during the beginning of its outward stroke (arrow F7), the rod 76 of the jack 77 causes the pivoting-by means Of the .Connecting-rod 78 and .Crank 7S-.0f the bending milled-wheel 9,41, until the linger 133 of this rod cornes into contact with the projection selected on the central tray 116. In a iirst stage, this rod rotatively drives the central tray around the shaft 197 in the direction of the arrow F9, so that the corresponding nipple 134 actuates the gate 135. During this rotation of slight ampltude, the nipples 13,6 of the central tray 116 compress the resilient members 13S. At a second stage, when rotation ends by abutment of the nipples 134 against the bottom of the grooves 14), the projection 13G stops the nger 133 of the rod 7d, because the central tray 116 is immobilised in relation to the notched disc 11i?. Consequently, the rotation of the bending milled-wheel 94 ceases at this precise moment.

When the rod 76 slides in the opposite direction for bringing the milledswheel 94 to its inactive position, the nger 133 of this rod leaves the projection 1311. Then the action of the springs 133 becomes preponderant, and the central tray 116 pivots in the opposite `direction to the arrow F9 until the nipples 134 abut against the opposite bottom of the grooves of the disc 1t?. From this return rotation, it results that the control of the gate is reversed.

The annular tray 125 has as many equidistant nipples 141 projecting as the `disc 110 delimits notches 111. Some 142 of these nipples 141 emerge in the grooves 143 of the disc 11) and are subjected to the action of springs 1414 tending `to thrust these nipples and annular tray 125 with which they are integral, to cause the pivoting of the latter in ,the opposite direction to the arrow F10, around the `shaft 16? and this in circumstances similar and in the same manner Vthat the resilient members 13S thrust the central tray 116.

The nipples 141 emerging in slots 145 of the disc 11o, on the one hand, limit the pivoting of the 'annular tray 125 in relation to the disc 110, and on the other, selectively actuate a gate 146 when the ringer 18 of the section 13 sliding in Athe `direction of the arrow F, cornes into Contact, at the end of the stroke, with the projection 131 and hence, rotatively drives the annular tray 125 integral with this projection, in `the direction of the arrow F10.

It will be noticed that the function of the annular tray 125 is similar to that of the central tray 116, the one, 115, being associated with the jack 77, whereas the other, 125' is associated with the mandrel 1g.

When starting a series of parts 101, the controlling device 1112 is regulated as described previously, so that the guiding-mark 122 showing through the port 12d corresponds to the values of the parameters L, or l of `the part chosen. Then a mandrel 19, a pulley 22, a plate 26, a jaw 87 and a shaping milled-wheel 94 whose dimensions correspond to the values of the parameters R and d of said part, are mounted on the machine.

When starting up the series, one proceeds as follows: the rocker 32 is in the position 33a, so that the pivoting support 25, provided with the plate 26 is deviated from the pulley 22. Moreover, the mobile jaw 87 is deviated from the bending milled-wheel 94. Lastly, the tube 19a is threaded on to the mandrel 19 and the rocker 32 locked towards the position 33b for which the tube is held, without excessive tightening, between the plate 26 and the pulley 22.

By closing the general switch of the machine, the electric motor 45 is fed, on the one hand, which drives the saw 47 rotatively, and on the other, an electro-valve (not shown) which controls the putting under pressure of the fluid circuit of the machine. This circuit supplies the various jacks 115, 53, 54, 77 and 84 under the control of the gates 17, 63, 69, 83, 135 and 146.

When starting up, the feed of the jack 53 causes the sliding, in the direction of the arrow F4, of the shaft 40 and underframe 36 supporting the saw 47, and this until the lug 49a of this shaft abuts against the projection 132 of the disc 110 of the controlling device 102. The parameter L is thus determined, once and for all, at the starting up of the series, because the jack 53 is constantly under pressure.

From then onwards, each cycle takes place as described in that which follows, from the bending operation:

The jack 77 is fed to cause the sliding of the rod 76 of the piston -in the direction of the arrow F7. This rod pulls the connecting-rod 78 which drives the crank 75 and shaft '74 with which it is integral, in rotation in the direction of the arrow Fu. Then, the milled wheel 94 bends the tube whose end 104 is securely held by the holder 83. At the end of the bending stroke, the finger 133 of the rod 76 comes into contact with the projection 131B of the central tray 116 of the controlling device. This results in the tray pivoting in the direction of the arrow F9 for actuating the gate 135 by means of the selected nipple 134, then, when the central tray 116 is immobilised in relation to the disc 110, the projection 1319 stops the finger 133 of the rod 76 and consequently limits the bending to the angular opening ot provided for.

The gate 135 controls the feed of the jack 15, so that the latter causes the displacement of the section 13, connecting the slides 7 and 8, in the direction of the arrow F. These slides drive the mandrel 19, the plate 26 and the pulley Z2 which slides or rolls along the tube 19a held by the jaw 83. At the end of the stroke of these slides, the finger 18 of the section 13 comes into contact with the selected projection 131 of the annular tray 125. r1`his results in the latter being rotatively driven in the direction of the arrow F10, so that theselected nipple 141 of said tray actuates the gate 146. When the annular tray 125 is immobilised in relation to the disc 110, by means of the nipples 141 penetrating into the grooves 145, the projection 131 stops the finger 13 of the section 13. The total stroke of the slides 7 and 8 corresponds substantially to the sum of the length of the parameters L and l, the parameter l being determined previously. Furthermore the position of the projection 131 rigorously determines the parameter L of the part, as explained in the foregoing.

The gate 146 controls the feed of the jacks 54 and Se. The piston of the jack 54 slides in the direction of the arrow F6, so that the push-rod S, when it faces the cavity 63 of said piston, no longer opposes the action of the resilient member 51B which causes the pivoting, in r v the direction of the arrow F3, of the underframe 36 supporting the saw 47. The latter effects the cut of the tube for separating the part 161. When the roller 59 leaves the cavity 63 of the piston 55, the push-rod 58, associated with the roller, slides in the opposite direction to the arrow F5 and thrusts the lip 61 of the bushing 62 to cause the reverse pivoting of the underframe 36 while tending to disengage the saw 47. At the end of the stroke of the piston 55 the finger 66 actuates the spindle 64 for locking the push-rod 58. Moreover, the feed of the jack 84 by the gate 146 causes the mobile jaw 88 to open and the part 101 falls into a pouring spout 147 integral with the upper tray 2 (FIGURE l2). A compressed air jet can eventually facilitate this operation.

At the end of the stroke, the piston 55 of the jack 54 actuates the gate 63 which feeds the jack I7 and the jack so that their pistons slide in the opposite direction respectively to the arrows F7 and F. This results in the bending milled-wheel 54 pivoting in an opposite direction with the jaw 87 open and that the Cil slides 7 and 8 provided with the mandrel 19, the plate 26 and the pulley 22, return to their original position while carrying along the tube. Thus, one length of the latter, substantially corresponding to the sum of the length of the parameters L and l is brought to the working position between the milled-wheel 94 and the mobile jaw 87.

At the end of the return stroke, the rim 82 of the rod 81 of thejack 77 actuates the gate S3 which feeds the jack 34. It follows that the mobile jaw 8S, associated with the piston S7 of this jack, slides towards closing for securing the end 1M of the tube against the bending cutting-wheel 914.

Likewise, at the end of the return stroke, the piston of the jack 15 actuates the gate 17 for feeding the jack 54 which causes the return sliding of the piston 55 in the opposite direction to the arrow F6. When passing the cavity 63 of this piston7 the push-rod 58 subjected to the action of the spring 5t), cannot move, nevertheless, because it is locked by the spindle 64. The unlocking of this spindle is effected, at the end of the stroke, by the finger 67 of the piston 55. But at the same time as the unlocking of the spindle 64 takes place, the end of the piston actuates the gate 69 which feeds the jack 67, according to the effect described at the beginning of the development of this cycle, to start up the next cycle.

Various modifications can moreover be applied to the form of embodiment shown and described in detail, without going outside of the scope of the invention.

l claim:

1. A machine, for bending and cutting a tube into lengths having rectilinear extensions of variable length on both sides of a bent portion, comprising a longitudinally extending body, a slide longitudinally movable on said body, a pressing device for guiding and holding the tube to be bent carried by said slide, said pressing device including a grooved plate and a cooperating pulley slightly pressing the tube but allowing sliding thereof, a tube supporting mandrel carried by said slide and longitudinally extended on both sides With respect to said pressing device, a removable milled-wheel mounted for rotary movement at one side of the pressing device and a movable jaw cooperating therewith to clamp the tube,

a common support holding said milled-wheel and jaw y initial positions, a rotating shaft carrying said support for turning said milled-wheel, jaw and common support to bend the tube, a power driven saw mounted for longitudinal and angular movements, means for independently moving said slide, shaft, clamping jaw and saw, and a control device for said moving means operative to sequentially move said jaw to clamp the tube against said milled-Wheel, move said saw longitudinally away from the milled-wheel, rotate said shaft, common support, milled-wheel and jaw a given extent to bend the tube, move said slide carrying the pressing device longitudinally away from the milled-Wheel without moving the tube, move said saw annularly into cutting engagement with the bent tube, move said jaw to release the tube and move said slide longitudinally toward the milledwheel to carry a new length of tube into position to repeat the cycle while turning said shaft and wheel back to their initial positions.

2. A machine according to claim l, wherein said slide comprises a first portion located near one end of said body, a second portion disposed in alignment with said first portion and located near the other end of said body, and a connecting rod disposed inside said body for rigid connection of said rst and second portions, said pressing device including an adjustable support interposed between said grooved plate and said first slide portion to adjust the pressing device according to the diameter of the tube to be bent and a hand operated mechanism to press said grooved plate in engagement With the tube toward said pulley and to release the plate.

3. A machine according t-o claim l, wherein said saw aoeeffls is eccentrically mounted with respect to an axially slidable shaft disposed longitudinally of said `body, and there is additionally provided a spring connected with said slidable shaft to cause rotation of the shaft to move the saw angularly into engagement with said tube, a jacl: connected to said slidable shaft to slide it to determined positions for cutting the tube, and a sliding operator and a second jack for actuation thereof connected to said slidable shaft to rotate the shaft in a reverse irection so as to disengage the saw from the tube.

4. A machine according to claim l, wherein said means for independently moving said slide, shaft, clamping jaw and saw includes a plurality of jacks independently connected to said slide, shaft, jaw and saw and a set of valves for supplying Huid to said jacks, said control device being adjustable to a plurality of positions for varying the timing of operation of said valves.

5. A machine according to claim 4, wherein said control device includes a plurality of crown shaped members concentrically disposed, a supporting disc onto which said crown shaped members bear, an actuating rod and a lever connected to said supporting disc for rotation thereof, spring members interposed between said supporting disc and said crown shaped members to enable limited movement between said supporting disc and each one of said crown shaped members, a set of projecting elements carried by said supporting disc and `by each one of said crown shaped members, a set of abutments connected to movable parts of said jacks and valves and arranged to engage corresponding projecting elements of said crown shaped members to appropriately sequence the timed operation of said Valves and packs.

References Cited in the le of this patent UNTED STATES PATENTS 1,397,847 Kellogg June 2, 1931 ,85l,276 Gordon Mar. 29, 1932 2,37l,393 Horrigan Mar. 13, 1945 

